Answer:
2.15 mg of uranium-238 decays
Explanation:
For decay of radioactive nuclide-
where N is amount of radioactive nuclide after t time, 
is initial amount of radioactive nuclide and 
is half life of radioactive nuclide
Here 
, 
and 
So,
so, N = 2.446 mg
mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg
By using thermal energy which is also heat energy the substance in cup A will melt becoming a liquid behaving like the substance in cup B
Replacement I think, hope this helps ;)
Explanation:
Answer:
The answer is A. Lithium and Sodium
Fog is a cloud that has its base at or near the ground.
The answer is letter D. Fog results when atmospheric water vapor condenses to
the extent that the new forms, water droplets or ice crystals, become visible. Saturation
of the air and sufficient condensation nuclei are ordinarily prerequisites for
the formation of fog. One of the great hazards associated with fog is a lack of
visibility.
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